It's common not to sleep without booze as the crutch, I know this from my own experience.
I slept so badly that I could not sleep without it, but it was not really "sleeping" its "passing out"
I think the reason you are noticing that you can't sleep well this time around is that your body has become accustomed to even more alcohol, it will probably just take longer this time, but it will get back to some kind of normality at some point, I think you just have to be patient.
But then nobody has ever died from lack of sleep, so take the positive out of that and good luck.